This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...
January 2017 - Mouser Electronics already has to supply the INA240 evaluation modules for current...
August 2016 - It can be found at Mouser Electronics the new sensors light to digital OPT3002 from...